CN110187275A - A kind of magneto method for detecting health status and system - Google Patents
A kind of magneto method for detecting health status and system Download PDFInfo
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- CN110187275A CN110187275A CN201910489156.3A CN201910489156A CN110187275A CN 110187275 A CN110187275 A CN 110187275A CN 201910489156 A CN201910489156 A CN 201910489156A CN 110187275 A CN110187275 A CN 110187275A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
The present invention relates to magneto health monitoring field, a kind of magneto method for detecting health status and system are disclosed, to realize the accurately detection to magneto health status；Corresponding statistical nature is extracted in measuring signal when the method for the present invention includes from motor operation, statistical nature includes frequency domain character, temporal signatures and time and frequency domain characteristics, is combined using binary condition branching algorithm feature needed for choosing reconstruction model in corresponding statistical nature；The history normal data for obtaining feature combination obtains reconstruction model from code machine according to history normal data training storehouse, and obtains health factor according to reconstruction model, uses the health status of health factor detection magneto.
Description
Technical field
The present invention relates to magneto health monitoring field more particularly to a kind of magneto method for detecting health status and
System.
Background technique
With the fast development of electric locomotive, safety and reliability is also increasingly taken seriously.And motor is as it
Core component, it is most important to the safe operation of locomotive.And operate on high pressure, high current, high-revolving incessantly for a long time
Under the conditions of, so that it is extremely easy to happen exception.So the traction electric machine of locomotive is the emphasis of whole system maintenance.Currently, being
The safe operation for guaranteeing motor, has had the method for detecting health status of many data-drivens to be suggested.But these methods, have
It is a little to rely on single features, the health problem of system can not be characterized comprehensively, and some are a large amount of special using more complicated method fusion
Sign, proposes higher requirement to the performance of monitoring device.
Therefore, how effective magneto health status that must detect is as a urgent problem.
Summary of the invention
It is an object of that present invention to provide a kind of magneto method for detecting health status and systems, to realize accurately to permanent magnetism
The detection of motor health status.
To achieve the above object, the present invention provides a kind of magneto method for detecting health status, comprising the following steps:
S1: extracting corresponding statistical nature in measuring signal when from motor operation, the statistical nature include frequency domain character,
Temporal signatures and time and frequency domain characteristics choose reconstruction model from the corresponding statistical nature using binary condition branching algorithm
Required feature combination；
S2: the history normal data of the feature combination is obtained, trains storehouse from code machine according to the history normal data
Obtain reconstruction model；
S3: obtaining health factor according to the reconstruction model, and the healthy shape of magneto is detected according to the health factor
State, if the health factor is greater than the health factor threshold value of setting, decision-making system state is abnormal；If the health factor
Less than or equal to the health factor threshold value of setting, then decision-making system state is healthy
Preferably, in S1, the frequency domain character includes FFT coefficient, the frequency domain degree of bias, frequency domain mean value and frequency domain variance；
The temporal signatures include mean value, variance, maximum value, the degree of bias, very poor, quantile, entropy；
The time and frequency domain characteristics include wavelet conversion coefficient and EMD trend.
Preferably, the S1 specifically includes the following steps:
S11: setting a total of S measuring signal, extracts F feature from each measuring signal, feature sum is denoted as Q；
The vector X tieed up with QKDefinition includes that the feature of health factor combines pKAre as follows:
In formula, xpIt is characterized the corresponding x value of p, p ∈ [1, Q], when feature p is contained in feature combination pKWhen, xpIt is 1, it is no
Then xpNumber of features in combination is indicated for 0, K；
S12: setting objective function, the calculation formula of the objective function are as follows:
J (X)=w1K+w2FAR+w3FDR；
In formula, K is feature quantity used, w1For the respective weights of feature quantity used, FAR is rate of false alarm, w2Accordingly to weigh
Weight, and the w2Negative value is taken, ADR is anomaly rate, w3For the respective weights of anomaly rate；
Wherein, the calculation formula of rate of false alarm FAR are as follows:
FAR=prob (HI > HIth| operate normally)；
In formula, prob indicates probability operator, and HI is health factor, HIthFor the threshold value of health factor, as HI > HIthWhen,
Judge that system mode is abnormal, otherwise judges that system is in health status；
The calculation formula of anomaly rate ADR are as follows:
FDR=prob (HI > HIth| misoperation)；
S13: the objective function is optimized using binary condition branching algorithm, obtains optimal solution Xbest:
Xbest=[xb1,xb2,xb3,...,xbQ]；
S14: the calculation formula of feature combination is established according to the optimal solution are as follows:
pKb=p | xbp=1, p ∈ [1, Q] }.
Preferably, it is described the objective function optimized using binary condition branching algorithm specifically includes the following steps:
An initial solution X is randomly generatedinit, and initial solution XinitAs current optimal solutionWherein xbi∈{0,1},i∈[1,Q]；
To XbestSuccessively swap transformation, running transform, symmetry transformation, replacement transformation obtain SE candidate solution X1,
X2,...,XSE, and update the optimal solution Xbest。
Preferably, the S2 specifically includes the following steps:
S21: data training storehouse of the feature in the feature combination in system worked well is chosen from code machine SAE
As reconstruction model；
S22: according to the value V of currently used featureK, VK=[v1,v2,...,vK]T, reconstruct these spies under normal circumstances
Levy most probable ideal value:
Wherein SAE is storehouse from code machine, viFor pKbThe value of middle ith feature, i ∈ [1, K],
For the ideal value of the normal condition of reconstruction model estimation, K is selected feature quantity；
S23: the calculation formula of health factor HI is defined according to the ideal value are as follows:
As HI > HIthWhen, it is believed that system mode is abnormal, otherwise it is assumed that system is in health status.
As a general technical idea, the present invention also provides a kind of magneto health status detection systems, including deposit
Reservoir, processor and storage on a memory and the computer program that can run on a processor, processor execution institute
The step of realizing the above method when stating computer program.
The invention has the following advantages:
The present invention provides a kind of magneto method for detecting health status and system, measurement letter when including from motor operation
Corresponding statistical nature is extracted in number, statistical nature includes frequency domain character, temporal signatures and time and frequency domain characteristics, using binary shape
State branching algorithm feature needed for choosing reconstruction model in corresponding statistical nature combines；Obtain the history normal number of feature combination
According to, reconstruction model is obtained from code machine according to history normal data training storehouse, and health factor is obtained according to reconstruction model,
Use the health status of health factor detection magneto；It is effectively explored in the present invention by using binary condition branching algorithm
Parameter space ensure that the arithmetic speed when solving optimal characteristics combination, and storehouse has been used to carry out signal weight from code machine algorithm
Structure can accurately rebuild signal, improve the precision of abnormality detection.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the magneto method for detecting health status flow chart of the preferred embodiment of the present invention；
Fig. 2 is the preferred embodiment of the present invention without health factor curve defined in feature selecting；
Fig. 3 is the bent by health factor defined in binary condition branching algorithm feature selecting of the preferred embodiment of the present invention
Line.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1
Referring to Fig. 1, the present embodiment provides a kind of magneto method for detecting health status, comprising the following steps:
S1: corresponding statistical nature is extracted in measuring signal when from motor operation, statistical nature includes frequency domain character, time domain
Feature and time and frequency domain characteristics, using binary condition branching algorithm spy needed for choosing reconstruction model in corresponding statistical nature
Sign combination；
S2: obtaining the history normal data of feature combination, is obtained according to history normal data training storehouse from code machine
Reconstruction model；
S3: obtaining health factor according to reconstruction model, the health status of magneto is detected according to health factor, if healthy
The factor is greater than the health factor threshold value of setting, then decision-making system state is abnormal；If health factor is less than or equal to setting
Health factor threshold value, then decision-making system state health.
Above-mentioned magneto method for detecting health status effectively explores parameter by using binary condition branching algorithm
Space ensure that the arithmetic speed when solving optimal characteristics combination, and storehouse has been used to carry out signal reconstruction from code machine algorithm,
Signal can accurately be rebuild, improve the precision of abnormality detection.
Preferably, in S1, frequency domain character includes FFT coefficient, the frequency domain degree of bias, frequency domain mean value and frequency domain variance；Time domain is special
Sign includes mean value, variance, maximum value, the degree of bias, very poor, quantile, entropy；Time and frequency domain characteristics include that wavelet conversion coefficient and EMD become
Gesture.It should be noted that the present invention does not limit the concrete type of statistical nature, above-mentioned saying to all types of statistical natures
It is bright to be only for example signal.
Specifically, the present embodiment is illustrated by taking certain permanent magnet synchronous motor as an example.By measuring three-phase electricity when its operation
Stream has obtained 20 groups of measurement data comprising different degrees of loss of excitation failure.Sample frequency is 2kHz, Shi Changwei 2s.
In the present embodiment, it includes 378 different characteristics that obtained characteristic set, which has altogether,.Then all features are first returned
One change processing, then choose data training storehouse of all features in system worked well from code machine, obtain one it is non-ideal
Health factor.Wherein rate of false alarm FAR is 0.5%, and anomaly rate ADR is 100%.In that case, but the spy that uses
It goes on a punitive expedition more, is unsatisfactory for the requirement of the optimum health factor, as shown in Figure 2.It should be noted that qualified health factor
FAR should be no more than 2% and ADR and be not less than 95%.HIthValue can influence FAR and ADR simultaneously.Threshold value is higher to make FAR lower
And ADR is lower.Threshold value is lower to make ADR higher, but FAR is also higher.So being preferably based on the side of Monte Carlo in the present embodiment
Method threshold value, limitation FAR are no more than 2%.
Further, Feature Selection is carried out by binary condition branching algorithm, specifically included:
Step 1: an initial solution X is randomly generatedK=[x1,x2,...,x189],xi∈ { 0,1 }, and it is set as optimal solution
Xbest, then the used character subset of the solution is by xKIn for 1 element corresponding feature composition.Use all features of this feature subset
Historical data when system operates normally trains storehouse from code machine.All history feature signals and again are calculated after completing training
The Euclidean distance for building characteristic signal, obtains the value in the undefined health factor of the solution, in the present embodiment, takes maximum allowable wrong report
Rate pFARIt is 2%, the threshold value HIthIt is determined using the method based on Monte Carlo, using threshold calculations actual FAR and ADR,
And calculating target function value J (Xbest)。
Step 2: to XbestIt swaps transformation and obtains SE new solution, and repeat above-mentioned method for solving calculating and newly solve
Target function value, if produced better than XbestSolution, update Xbest；
To XbestIt carries out running transform and obtains SE new solution, and repeat above-mentioned method for solving calculating and newly solve objective function
Value, if produced better than XbestSolution, update Xbest；
To XbestIt carries out symmetry transformation and obtains SE new solution, and repeat above-mentioned method for solving calculating and newly solve objective function
Value, if produced better than XbestSolution, update Xbest；
To XbestIt is replaced transformation and obtains SE new solution, and repeat above-mentioned method for solving calculating and newly solve objective function
Value, if produced better than XbestSolution, update Xbest；
Judge whether to meet termination condition, is unsatisfactory for then return step two.
In the present embodiment, termination condition is to reach the number of iterations of setting.It can also be with XbestDo not occur several times more continuously
It is newly termination condition.
By above-mentioned optimization, it ensure that the feature extracted can sufficiently characterize the health status of motor, using corresponding strong
Kang Yinzi largely can improve convenience for the maintenance work of motor.
Finally, in the present embodiment, 218 features, the primary condition that FAR 0.5%, ADR are 99% are used in initial solution
Under, 63 features, the ideal health factor that FAR 0.43%, ADR are 100% have been obtained after 15 wheel iteration
Definition, as shown in Figure 3.
In on-line monitoring, acquires motor operation signal and calculate 63 features, these features are merged by reconstruction model
Obtain the value of the health factor of online monitoring data.Again by the threshold value HI of the value and settingthCompare, that is, can determine whether the operation of system
State.If the value of the health factor of online monitoring data is greater than the threshold value HI of settingth, then decision-making system state is abnormal；If
The value of the health factor of online monitoring data is less than or equal to the threshold value HI of settingth, then decision-making system state is healthy.
Embodiment 2
With above method embodiment correspondingly, the present embodiment provides a kind of magneto health status detection system, packet
The computer program that includes memory, processor and storage on a memory and can run on a processor, the processor execute
The step of above method is realized when the computer program.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of magneto method for detecting health status, which comprises the following steps:
S1: corresponding statistical nature is extracted in measuring signal when from motor operation, the statistical nature includes frequency domain character, time domain
Feature and time and frequency domain characteristics are chosen needed for reconstruction model using binary condition branching algorithm from the corresponding statistical nature
Feature combination；
S2: obtaining the history normal data of the feature combination, is obtained according to history normal data training storehouse from code machine
Reconstruction model；
S3: obtaining health factor according to the reconstruction model, and the health status of magneto is detected according to the health factor, if
The health factor is greater than the health factor threshold value of setting, then decision-making system state is abnormal；If the health factor is less than
Or the health factor threshold value equal to setting, then decision-making system state is healthy.
2. magneto method for detecting health status according to claim 1, which is characterized in that in S1, the frequency domain is special
Sign includes FFT coefficient, the frequency domain degree of bias, frequency domain mean value and frequency domain variance；
The temporal signatures include mean value, variance, maximum value, the degree of bias, very poor, quantile, entropy；
The time and frequency domain characteristics include wavelet conversion coefficient and EMD trend.
3. magneto method for detecting health status according to claim 1, which is characterized in that the S1 specifically include with
Lower step:
S11: setting a total of S measuring signal, extracts F feature from each measuring signal, feature sum is denoted as Q；
The vector X tieed up with QKDefinition includes that the feature of health factor combines pKAre as follows:
In formula, xpIt is characterized the corresponding x value of p, p ∈ [1, Q], when feature p is contained in feature combination pKWhen, xpIt is 1, otherwise xpFor
0, K indicates number of features in combination；
S12: setting objective function, the calculation formula of the objective function are as follows:
J (X)=w1K+w2FAR+w3FDR；
In formula, K is feature quantity used, w1For the respective weights of feature quantity used, FAR is rate of false alarm, w2For respective weights,
And the w2Negative value is taken, ADR is anomaly rate, w3For the respective weights of anomaly rate；
Wherein, the calculation formula of rate of false alarm FAR are as follows:
FAR=prob (HI > HIth| operate normally)；
In formula, prob indicates probability operator, and HI is health factor, HIthFor the threshold value of health factor, as HI > HIthWhen, judge be
System state is abnormal, and otherwise judges that system is in health status；
The calculation formula of anomaly rate ADR are as follows:
FDR=prob (HI > HIth| misoperation)；
S13: the objective function is optimized using binary condition branching algorithm, obtains optimal solution Xbest:
S14: the calculation formula of feature combination is established according to the optimal solution are as follows:
pKb=p | xbp=1, p ∈ [1, Q] }.
4. magneto method for detecting health status according to claim 3, which is characterized in that described to use binary condition
Branching algorithm optimize the objective function specifically includes the following steps:
An initial solution X is randomly generatedinit, and initial solution XinitAs current optimal solution
Wherein xbi∈{0,1},i∈[1,Q]；
To XbestSuccessively swap transformation, running transform, symmetry transformation, replacement transformation obtain SE candidate solution X1,X2,...,
XSE, and update the optimal solution Xbest。
5. magneto method for detecting health status according to claim 1, which is characterized in that the S2 specifically include with
Lower step:
S21: data training storehouse of the feature in the feature combination in system worked well is chosen from code machine SAE conduct
Reconstruction model；
S22: according to the value V of currently used featureK, VK=[v1,v2,...,vK]T, these features are most under normal circumstances for reconstruct
Possible ideal value:
Wherein SAE is storehouse from code machine, viFor pKbThe value of middle ith feature, i ∈ [1, K],Attach most importance to
The ideal value of the normal condition of structure model estimation, K are selected feature quantity；
S23: the calculation formula of health factor HI is defined according to the ideal value are as follows:
As HI > HIthWhen, it is believed that system mode is abnormal, otherwise it is assumed that system is in health status.
6. a kind of magneto health status detection system, including memory, processor and storage are on a memory and can be
The computer program run on processor, which is characterized in that the processor realizes above-mentioned power when executing the computer program
Benefit requires the step of 1 to 5 any the method.
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